WebRTC-DeprecateGlobalFieldTrialString/Enabled/ - part 12/inf

rename WebRtcKeyValueConfig to FieldTrialsView

Bug: webrtc:10335
Change-Id: If725bd498c4c3daf144bee638230fa089fdde833
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256965
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36365}
diff --git a/call/call.h b/call/call.h
index 11451c5..e4652d2 100644
--- a/call/call.h
+++ b/call/call.h
@@ -174,7 +174,7 @@
   virtual void SetClientBitratePreferences(
       const BitrateSettings& preferences) = 0;
 
-  virtual const WebRtcKeyValueConfig& trials() const = 0;
+  virtual const FieldTrialsView& trials() const = 0;
 
   virtual TaskQueueBase* network_thread() const = 0;
   virtual TaskQueueBase* worker_thread() const = 0;